Copying and pasting keyframes is covered on page 435 in the manual. However, since it's so easy to save your own presets, I find it's faster to save the item you like and then just swap out the text or media. For example, if you make a text animation that you like, just drag the text object into the Favorites folder in the Library. Then in a new project, import the object and change the text, font, etc.
This method applies to anything: particle systems, replicators, shapes, text, graphics, behaviors, filters, etc.
Mark